Chapter 3 Interface
3.1 Interface
Specifications
Data Transmission Method : Asynchronous Serial.
Handshaking : DTR/DSR Control
Default Protocol : 9600/19200 bps, non-parity, 8 data bits, 1 stop bit.
Communication Protocol
1. Receive Data.
The DTR signal is as follows:
[HIGH] This indicates that the display isn't ready to receive data.
It depend on the following conditions:
The period from when the power is turned on to when the printer
first becomes ready to receive data.
When the remaining space in the receiving buffer becomes 128
bytes or less.
When the DTR signal of the printer is HIGH when the printer is
selected using the command.
[LOW] This indicates that the display is ready to receive data.
It depends on the following conditions:
When the printer first becomes ready to receive data after power-on.
When the remaining space in the receiving buffer becomes 128 bytes
or more.
When the DTR signal of the printer is LOW when the printer is
selected using the command.
2. Transmit Data.
After confirming the DSR is LOW, data is transmitted to printer.
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